| 摘要 |
PROBLEM TO BE SOLVED: To eliminate a problem of requiring two lines of piping systems to make the piping systems complicated, and require more piping material in composing a snow eliminating system, for example, using a conventional two- way check valve. SOLUTION: This three-way check valve comprises a valve casing having three ports through which fluid flows in and out, and a spherical valve element included in the valve casing. The valve element is disposed to be movable between two of the three ports. The valve element is moved by fluid pressure or its weight, so that either of the two ports is closed by the valve element.
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